• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.11a
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• pp.75-78
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• 2013

최근 3D의 발전으로 다음 세대의 3D 기술로 디지털 홀로그램을 지목하고 있다. 본 논문에서는 프레넬릿 변환을 이용하여 디지털 홀로그램 압축을 위한 효과적인 양자화 방법에 대하여 제안하였다. 효과적인 양자화 방법을 위해 각각의 부대역의 특성에 고려하여 우선순위를 정하고 양자화를 적용하였다. 또한 PSNR을 높이고자 예외 인덱스를 적용하였다. 그 결과 2dB 정도 높아지는 것을 확인할 수 있었다. 실험결과에서는 최소 약 6:1부터 최대 약 181:1까지 압축을 수행하였고, PSNR을 이용하여 압축된 영상에 대하여 수치적인 결과를 분석하였다.

• Proceedings of the KAIS Fall Conference
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• 2010.05a
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• pp.455-458
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• 2010

침입탐지시스템은 공격이라고 판단되면 경보를 발생하여 보안 관리자에게 알려주거나 자체적으로 대응을 하게 된다. 그러나 이러한 경보들 중에 오경보가 많이 포함되어 있어 침입탐지시스템의 성능을 저하시킬 뿐 아니라 대량의 경보자체가 보안메커니즘에 방해가 되고 있다. 특히 오경보중 False Positive가 전체 오경보의 대부분을 차지하고 있다. 즉, False Positive는 정상 행위를 침입행위로 오인하여 판단하는 것을 의미한다. 경보들 중 이러한 오경보들은 네트워크 전반에 걸친 보안 서비스의 질을 하락시키는 원인이 된다. 따라서 침입탐지시스템의 성능향상을 위해서는 이러한 오경보 문제가 반드시 해결되어야 한다. 본 논문에서는 침입탐지시스템의 오경보를 감소시키는 결정트리 기반 오경보 분류모델을 제안하였다. 결정트리 기반 오경보 분류 모델은 침입탐지시스템의 오경보율을 감소시키고 침입탐지율을 향상시키는 역할을 수행한다는 것을 확인할 수 있었다.

• Proceedings of the KSRS Conference
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• 2003.11a
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• pp.476-478
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• 2003

Capability of material fixation in forest was noticed since COP3, but now it was difficult to understand material fixation in wide area. In this study, we attempted to estimate and test the amount of carbon, nitrogen, and phosphorus fixed by forest from satellite images. First, we classified into tree species and estimated the number of trees in the forest by species, area, and digital numbers. We inspected to apply it in wide area. Next, we compared the amount of carbon, nitrogen, and phosphorus with NDVI and each band of satellite images.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10a
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• pp.655-657
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• 2001

포렌식 컴뷰팅에 관하여 1984년부터 많은 연구가 진행되어 왔으며, 이 분야 연구는 주로 디스크에 관한 화학적, 물리적 방법을 이용한 증거 추출(Evidence Capture)에 중점을 두어 왔다. 최근 forensic software engineering 분야의 접근은 알고리즘의 error detection에 연구방향을 두고 있다. 그러나 지적 재산권 법을 온라인 상에서 컨텐츠를 이용하는 가운데 적용 시키는 연구는 미비하다. 본 연구에서는 지적 재산권을 이용한 XML tree를 만들고, parsing하여 RDB를 구축한 후 질의 (query)하여 매핑(mapping)시키는 시스템을 구현 하고자 한다. 입력자료는 우리가 기존에 개발한 DRM(Digital Rights Management)시스템에서 사용자를 모니터링하여 검출한 불법 복사/증거 프로 파일로 한다. 이것은 법 전문가에 의뢰하기 전에, 사용되는 컨텐츠가 법에 위배 된다면 지적재산권 법 몇조 몇항에 해당되는지를 사용자, 대리인/변호인, attorney, judge 등에게 컨설팅 해주는 시스템이다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.24 no.1
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• pp.138-140
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• 2020

As the IoT is applied to home and industrial networks, data generated by the IoT is being processed at the cloud edge. Intrusion detection function is very important because it can be operated by invading IoT devices through the cloud edge. Data delivered to the edge network in the cloud environment is traffic at the application layer. In order to determine the intrusion of the packet transmitted to the IoT, the intrusion should be detected at the application layer. This paper proposes the intrusion detection function at the application layer excluding normal traffic from IoT intrusion detection function. As the proposed method, we obtained the intrusion detection result by decision tree method and explained the detection result for each feature.

• Journal of the Korean Institute of Telematics and Electronics
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• v.23 no.4
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• pp.429-438
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• 1986

In this paper we have designed and implemented a real-time, full-duplex SBC (sub-band coding) codec at 16kbps using a high speed digital signal processor, NEC 7720. The SBC codec employs a QMF(quadrature mirror filter) filter bank based on the tree structures of two-band analysis-synthesis pairs to partition speech signal into 4 octabe bands. Computer simulation has been done to investigate the effect of fixed-point computation of the NEC 7720. Three different performance measures, the conventional signal-to-noise ratio, the informal listening test, and an LPC(linear predictive coding)distance measure, have been used in this simulation. The necessary parameters have been optimized through the simulation. The developed hardware and software have been tested in real-time operation using a hardware emulator.

• Journal of Korean Society of Archives and Records Management
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• v.10 no.2
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• pp.75-99
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• 2010

Digital resources are widely used in our modern society. However, we are facing fundamental problems to maintain and preserve digital resources over time. Several standard methods for preserving digital resources have been developed and are in use. It is widely recognized that metadata is one of the most important components for digital archiving and preservation. There are many metadata standards for archiving and preservation of digital resources, where each standard has its own feature in accordance with its primary application. This means that each schema has to be appropriately selected and tailored in accordance with a particular application. And, in some cases, those schemas are combined in a larger frame work and container metadata such as the DCMI application framework and METS. There are many metadata standards for archives of digital resources. We used the following metadata standards in this study for the feature analysis me metadata standards - AGLS Metadata which is defined to improve search of both digital resources and non-digital resources, ISAD(G) which is a commonly used standard for archives, EAD which is well used for digital archives, OAIS which defines a metadata framework for preserving digital objects, and PREMIS which is designed primarily for preservation of digital resources. In addition, we extracted attributes from the decision tree defined for digital preservation process by Digital Preservation Coalition (DPC) and compared the set of attributes with these metadata standards. This paper shows the features of these metadata standards obtained through the feature analysis based on the records lifecycle model. The features are shown in a single frame work which makes it easy to relate the tasks in the lifecycle to metadata elements of these standards. As a result of the detailed analysis of the metadata elements, we clarified the features of the standards from the viewpoint of relationships between the elements and the lifecycle stages. Mapping between metadata schemas is often required in the long-term preservation process because different schemes are used in the records lifecycle. Therefore, it is crucial to build a unified framework to enhance interoperability of these schemes. This study presents a basis for the interoperability of different metadata schemas used in digital archiving and preservation.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.37 no.2
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• pp.50-59
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• 2000

Stereo vision is a technique extracting depth information from stereo images, which are two images that view an object or a scene from different locations. The most important procedure in stereo vision, which is called stereo matching, is to find the same points in stereo images. It is difficult to match stereo images in real time because stereo matching requires heavy calculation. In this Paper we design a digital VLSI to Process stereo matching in real time, which we call stereo image match processor (SIMP). For implementation of real time stereo matching, sliding memory and minimum selection tree are presented. SIMP is designed with pipeline architecture and parallel processing. SIMP takes 64 gray level 64$\times$64 stereo images and yields 8 level 64 $\times$64 disparity map by 3 bit disparity and 12 bit address outputs. SIMP can process stereo images with process speed of 240 frames/sec.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.10a
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• pp.830-833
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• 2007

In this paper, we implemented a $17{\times}17b$ binary digital multiplier using radix-4 Booth;s algorithmand proposed an efficient testing methodology for the full-custom design. A two-stage pipeline architecture was applied to achieve higher throughput and 4:2 adders were used for regular layout structure in the Wallace tree partition. Several chips were fabricated using LG Semicon 0.6-um 3-Metal N-well CMOS technology. We did fault simulations efficiently using the proposed test method resulting in the reduction of the number of faulty nodes by 88%. The chip contains 9115 transistors and the core area occupies $1135^*1545$ mm2. The functional tests using ATS-2 tester showed that it can operate with 24 MHz clock at 5.0 V at room temperature.

• Journal of The Korean Society of Agricultural Engineers
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• v.52 no.3
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• pp.39-45
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• 2010

Quantification of carbon absorption and understanding the human induced land use changes (LUC) forms one of the major study with respect to global climatic changes. An attempt study has been made to quantify the carbon absorption by LUC through remote sensing technology. The Landsat imagery four time periods was classified with the hybrid classification method in order to quantify carbon absorption by LUC. Thereafter, for estimating the amount of carbon absorption, the stand biomass of forest was estimated with the total weight, which was the sum of individual tree weight. Individual tree volumes could be estimated with the crown width extracted from digital forest cover type map. In particular, the carbon conversion index and the ratio of the $CO_2$ molecular weight to the C atomic weight, reported in the IPCC guideline, was used to convert the stand biomass into the amount of carbon absorption. Total carbon absorption has been modeled by taking areal estimates of LUC of four time periods and carbon factors for land use type and standing biomass. Results of this study, through LUC suggests that over a period of construction, 7.10 % of forest and 9.43 % of barren were converted into urban. In the conversion process, there has been a loss of 6.66 t/ha/y (7.94 %) of carbon absorption from the study area.